Rubber composition and tire

Abstract

Provided is a rubber composition in which static ozone resistance, dynamic ozone resistance and discoloration resistance are highly balanced. Also provided is a tire in which static ozone resistance, dynamic ozone resistance and discoloration resistance are highly balanced. The rubber composition comprises a rubber component, a petroleum wax, and an antidegradant, wherein the petroleum wax comprises a C20-C34 hydrocarbon component and a C35 or higher hydrocarbon component, and a proportion of the C20-C34 hydrocarbon component is 15% by mass to 30% by mass and a proportion of the C35 or higher hydrocarbon component is 70% by mass to 85% by mass, based on a total mass of the C20-C34 hydrocarbon component and the C35 or higher hydrocarbon component.

The invention claimed is: 
     
       1. A rubber composition comprising a rubber component, a petroleum wax, and an antidegradant,
 wherein the petroleum wax comprises a C20-C34 hydrocarbon component and a C35 or higher hydrocarbon component, and 
 a proportion of the C20-C34 hydrocarbon component is 15% by mass to 30% by mass and a proportion of the C35 or higher hydrocarbon component is 70% by mass to 85% by mass, based on a total mass of the C20-C34 hydrocarbon component and the C35 or higher hydrocarbon component, 
 wherein a proportion of a C20-C25 hydrocarbon component in the C20-C34 hydrocarbon component is 1.5% by mass to 4.5% by mass based on the total mass. 
 
     
     
       2. The rubber composition of  claim 1 , wherein a proportion of a non-normal paraffin is 35% by mass to 65% by mass based on a mass of the petroleum wax. 
     
     
       3. The rubber composition of  claim 1 , wherein a proportion of a C45 or higher hydrocarbon component in the C35 or higher hydrocarbon component is 20% by mass or more based on the total mass. 
     
     
       4. The rubber composition of  claim 1 , wherein the antidegradant is contained in an amount of 2.5 parts by mass or more based on 100 parts by mass of the rubber component. 
     
     
       5. The rubber composition of  claim 1 , wherein the petroleum wax is contained in an amount of 1.0 part by mass to 2.5 parts by mass based on 100 parts by mass of the rubber component. 
     
     
       6. A tire comprising a tread, a sidewall or a combination thereof in which the rubber composition according to  claim 1  is used. 
     
     
       7. The rubber composition of  claim 2 , wherein a proportion of a C45 or higher hydrocarbon component in the C35 or higher hydrocarbon component is 20% by mass or more based on the total mass. 
     
     
       8. The rubber composition of  claim 2 , wherein the antidegradant is contained in an amount of 2.5 parts by mass or more based on 100 parts by mass of the rubber component. 
     
     
       9. The rubber composition of  claim 2 , wherein the petroleum wax is contained in an amount of 1.0 part by mass to 2.5 parts by mass based on 100 parts by mass of the rubber component. 
     
     
       10. A tire comprising a tread, a sidewall or a combination thereof in which the rubber composition according to  claim 2  is used. 
     
     
       11. The rubber composition of  claim 3 , wherein the antidegradant is contained in an amount of 2.5 parts by mass or more based on 100 parts by mass of the rubber component. 
     
     
       12. The rubber composition of  claim 3 , wherein the petroleum wax is contained in an amount of 1.0 part by mass to 2.5 parts by mass based on 100 parts by mass of the rubber component. 
     
     
       13. A tire comprising a tread, a sidewall or a combination thereof in which the rubber composition according to  claim 3  is used. 
     
     
       14. The rubber composition of  claim 4 , wherein the petroleum wax is contained in an amount of 1.0 part by mass to 2.5 parts by mass based on 100 parts by mass of the rubber component. 
     
     
       15. A tire comprising a tread, a sidewall or a combination thereof in which the rubber composition according to  claim 4  is used.